-ition

American  

1. a compound suffix of nouns, being -tion with a preceding original or formative vowel, or, in other words, a combination of -ite and -ion.

   expedition; extradition.

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Etymology

Origin of -ition

< Latin -itiōn- or -ītiōn-, stem of -itiō or -ītiō. See -ite ², -ion